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The world's best gem articles, published weekly.

Most Recent Articles

Azurite Value, Price, and Jewelry Information

Collectors prize deep blue azurite crystals, but faceted gems are extremely rare. However, azurite frequently occurs mixed with green malachite, and this material is commonly used for cabochons and decorative objects.

Gemstone Optics: The Basics

Accurately measuring optical properties is critical for identifying gemstones. This article covers the basic terminology and concepts of gemstone optics.

Three-Carat Diamond Guide: Prices & Tips

Three carats is a dream size for many diamond shoppers. Learn about current prices and how to find the best three-carat diamond within your budget.

Creating an Ethical Engagement Ring: the Complete Guide

If you’re trying to create an ethical engagement ring, you have some research ahead. Our guide can help you shop for ethically sourced gemstones and gold.

Eight Opal Types Explained

Opal is a complicated gemstone, and many factors affect its price. Learn how to distinguish these eight opal types and how they differ in value.

Radiant-Cut Diamonds: Modern & Durable

Exceptionally sparkly, radiant-cut diamonds are great for engagement rings. But how can you find a top-quality gem? Read our tips for buying radiants here.

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
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Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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